Final answer:
The document sent to the king was called the Magna Carta. It was established in 1215 and limited the monarchy, established the guarantee of trial by jury, and established due process for the nobles.
Step-by-step explanation:
The document sent to the king was called the Magna Carta. The Magna Carta, or great charter, was established in 1215 and limited the monarchy, established the guarantee of trial by jury, and established due process for the nobles. These guarantees helped establish a clearer legal system and protect the rights of England's citizens.